Key-seat for wind musical instruments.



C. G. CONN. AT FOR WIND MUSICAL INSTRUMENTS.

KEY SE APPLICATION FILED JUNE 3. I915.

Patented Apr. 24,1917.

CHARLES e. CONN, or ELKHART, INDIANA.

KEY-

SEAT FOR WIND MUSICAL INSTRUMENTS.

Specification of Letters Patent.

Patented Apr, 24, 1917.

Application filed June 8, 1915. Serial N 0. 32,922.

To all whom it may concern:

Be it known that I, CHARLES G. CONN, a

citizen of the United States, residing at Elkhart, county of Elkhart, State of Indiana,

ave invented certain new and useful Improvements in Key-Seats for Wind Musical Instruments, of which the following is a specification.

y invention relates in general to key seats on wind musical instruments, and particularly to the construction of integral key seats on separate pieces of metal. Heretofore key seats which have been provided on the curved metal walls of wind musical instruments, have been produced by forming a ognized -as unsatisfactory not only from a mechanical standpoint, but principally for musical considerations. The present inven tion has for its primary object to produce the key seats on a specially constructed metal plate, which plate, after the key seats have been formed, is to be soldered or brazed in position on the tubular wall of the instrument.

1y explained in the pending application above referred to, it is necessary for musical considerations that there be substantial uniformity in the distribution of the metal forming the flanges of the seats, notwithstanding the fact that the flanges willbe higher at some points than at others by reason of pro ection from a substantially, cylindrical surface; for which reason openings are formed, by a suitable punching device, in the plate within the area of the ulti mate key openings and these openings are of such shape as to leave between the diiferent points on their perimeter and the perimeter of the circular key openings ultimately to be formed, metal substantially corresponding in dimension to the height of the flanges which such metal is required to form at these points. Suitable dies are then placed over the metal to be drawn up, with openings corresponding to the external diameter of the flanges to he formed, and a specially formed mandrel is then forced inwardly through the reduced openings to draw the metal into the form of flanges.

The shape of the dies is preferably such that they first act 'upon the metal corresponding to the deeper portion of the flanges to be formed, and they have circular sections of such diameters as to force the metal out against the surrounding dies when they reach their final positions. After the flanges are thus formed, their edges may be trimmed as by a rotary cutter, or any other key valves seat.

he invention will be more fully understood upon reference to the accompanying drawings, in which- Figure 1, is a cross section of a wind musical instrument tube showing an embodiment of my present invention.

ig. 2, is a fragmentary top-plan view of the construction shown in Fig. 1.

Referring to the drawings in detail, 1 represents a metal anchor or base plate which after it has been trimmed to the desired size 11s subjected to the punching and shaping me.

With a plate thus shaped and having flanges 6, 6 and 6 formed on its outer surface, it may be soldered or brazed to the tubular body of the wind musical instrument, with the openings in the respective key seats coaxial with the openings in the body of the instrument. 7 represents a suitable post for supporting the key levers.

While, in its broadest aspect, the present invention consists in forming upon a separate and subsequently attached base-plate, integral key-seats drawn out of the body of ment of a plurality of seats all formed on the base, and therefore greater accuracy in relationship of the seats one to another, and particularly the relationship of a seat ofiset relative to the medial axial line of the tube to those seats occupying true radial positions relative to the medial axial line of the tube; musical instrument tube of substantially cyand it also provides for conveniently and lindrical form, having suitably located key- 4) firmly mounting the key posts without the Openings in the cylindrical wall: a metal necessity of perforating the barrel of the inplate conforming to the cylindrical surface strument. of the instrument and intimately united I claim therewith, and having key-openings regis- 1. In combination with a metallic wind tering with the key openings of the instru- 25 musical instrument tube of substantially cy ment; said plate having formed thereon, lindrical form, having suitably located keyaround its said key-openings, integral raised openings in the cylindrical wall; a metal flanges providing key seats, the bases of late conforming to the cylindrical surface said key seats being intimately united of the instrument and intimately united through their integral attaching plate to the 30 therewith, and having key-openings regisdefining margins of the key-openings in the tering with the key openings of the instruinstrument wall. ment; said plate having formed thereon, The foregoing specification signed at Elkaround its said key-openings, integral raised hart, Indiana, this 18th day of May, 1915. flanges providing key seats.

2. In combination with a metallic wind CHARLES G. CONN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. 0. 

